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CVE-2009-1535: The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers t...

The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a "/protected/" initial pathname component to bypass the password protection on the protected\ folder, aka "IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability," a different vulnerability than CVE-2009-1122.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This issue affects Microsoft IIS 5.1 and 6.0 when WebDAV is enabled. A remote attacker could bypass path-based protection and access protected content, including listing folders or reading, creating, or modifying files. The business risk is highest for legacy internet-facing IIS servers still relying on WebDAV and URI-based access controls. Exposure is most likely on legacy Windows systems running IIS 5.1 or IIS 6.0 with WebDAV enabled, especially where protected directories depend on URI/path authentication controls. Modern environments should still check for forgotten legacy servers, development hosts, or internal publishing endpoints. Treat this as a legacy exposure cleanup priority. Internet-facing affected IIS WebDAV servers should be remediated urgently because the flaw can undermine authentication boundaries and affect file integrity. If no such systems exist, document that validation and keep it in legacy asset controls. Mitigation focus: Apply Microsoft security update MS09-020 where the affected IIS versions remain in use.; Disable WebDAV on IIS 5.1 or 6.0 systems unless it is operationally required.; Replace unsupported legacy IIS deployments with supported platforms where possible..

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Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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3Source links

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